ISO 3185-2021 PDF

Full title and description

ISO 3185:2021 — Aerospace — Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa — Dimensions. This International Standard specifies the dimensional characteristics for normal bihexagonal‑head aerospace bolts with specified shank and MJ thread lengths for metallic materials (coated or uncoated) up to the stated strength class.

Abstract

This document defines the dimensions and associated designation details for normal bihexagonal head bolts with a normal shank and short or medium length MJ threads intended for aerospace applications. It applies to metallic bolts (coated or uncoated) with strength classes less than or equal to 1 100 MPa and is intended to be used in the compilation and application of aerospace product standards.

General information

• Status: Published.
• Publication date: March 2021 (Edition 3, 2021-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.030.20 (Aerospace engineering and systems).
• Edition / version: Edition 3 (2021).
• Number of pages: 4.

Scope

ISO 3185:2021 specifies the dimensions of normal bihexagonal head bolts having a normal shank with short or medium length MJ threads, made of metallic material (either coated or uncoated), and belonging to strength classes up to and including 1 100 MPa. The standard is intended for use in aerospace product standards and for designers, manufacturers and procurers of aerospace fasteners who require standardized dimensions and designation for these bolt types.

Key topics and requirements

• Dimensional specification for normal bihexagonal head bolts (head geometry and relevant dimensions).
• Designation of shank type (normal shank) and MJ thread lengths (short or medium).
• Applicability to metallic materials, with or without coating.
• Applicability limited to strength classes ≤ 1 100 MPa.
• Intended integration with aerospace product standards and parts lists (compatibility for procurement and interchangeability).
• Edition and revision status (third edition, replacing the 2008 edition).

Typical use and users

Typical users include aerospace design engineers, fastener manufacturers, quality and standards teams in aerospace OEMs and suppliers, procurement specialists specifying bolt dimensions and classes, and maintenance/repair organisations requiring correct replacement parts. The standard is used to ensure dimensional interchangeability and to support procurement and certification of aerospace fasteners.

Related standards

Related or nearby standards include the previous edition ISO 3185:2008 (withdrawn and replaced by the 2021 edition) and other ISO standards covering different bolt head sizes and strength ranges such as ISO 3186 (bolts with large bihexagonal head for higher strength classes). Users should consult the relevant ISO series for complementary dimensions, material and strength class specifications used in aerospace fasteners.

Keywords

aerospace; bolts; bihexagonal head; MJ threads; bolt dimensions; fasteners; strength class 1100 MPa; shank; ISO 3185; standard; procurement.

FAQ

Q: What is this standard?

A: ISO 3185:2021 is an International Standard that specifies the dimensional requirements for normal bihexagonal‑head bolts with a normal shank and short or medium MJ threads for metallic materials up to strength class 1 100 MPa, intended primarily for aerospace applications.

Q: What does it cover?

A: It covers the geometry and dimensions of the bolt head, shank and thread length categories (short/medium MJ), material/coating applicability, and dimensional designation to support interchangeability in aerospace product standards.

Q: Who typically uses it?

A: Aerospace engineers, fastener designers and manufacturers, procurement and quality assurance teams in aerospace supply chains, and maintenance organisations that require standardized bolt dimensions for design, manufacturing and replacement.

Q: Is it current or superseded?

A: ISO 3185:2021 is the current (third) edition published in March 2021, which supersedes the previous ISO 3185:2008. The document is published and under the normal ISO review lifecycle.

Q: Is it part of a series?

A: Yes. ISO 3185 is part of the broader set of ISO standards addressing aerospace fasteners and bolt dimensions; related standards cover different head sizes, shank types and higher strength classes (for example ISO 3186 for large bihexagonal head bolts and other nearby numbers in the ISO 3000–3999 range).

Q: What are the key keywords?

A: Aerospace, bolts, bihexagonal head, MJ threads, dimensions, fasteners, strength class 1100 MPa, ISO 3185.